Serena is cycling from dance class to her home. The equation shows Serena's distance (y), in miles, from her home after x minutes:

y = 16 − 6x

What does the number 16 in the equation represent? (1 point)

a
Serena's distance from home when she begins cycling

b
Serena's distance from the dance class when she begins cycling

c
The speed at which Serena is cycling from the dance class to her home

d
The rate of change of Serena's speed while cycling from the dance class to her home